The answer to 'how much to replace humidifier in Illinois' is that the cost to replace a whole-home humidifier can vary significantly depending on factors like the size of your home, the type of humidifier, and the complexity of the installation. In general, you can expect to pay anywhere from $300 to $800 for a basic whole-home humidifier replacement, with the average being around $500.
The cost can be influenced by things like the type of humidifier (drum, steam, or flow-through), whether any ductwork or plumbing modifications are needed, and the labor rates in your local area. It's always best to get quotes from a few reputable HVAC contractors in your Illinois community to get the most accurate estimate for your specific situation.